glib-2.0: Fix ChildWatchSource binding
glib-2.0: Fix ChildWatchSource binding

Fixes bug 647911.

jessevdk/vala,GNOME/vala,xdave/pvala,frida/vala,frida/vala,tjol/vala-tjol,frida/vala,jessevdk/vala,GNOME/vala,rvu95/vala,GNOME/vala,kamanashisroy/aroop,flobrosch/vala-fixes,frida/vala,spidermonkdust/vala,Distrotech/vala,tjol/vala-tjol,jessevdk/vala,kamanashisroy/aroop,playya/vala,spidermonkdust/vala,spidermonkdust/vala,severinh/vala,playya/vala,flobrosch/vala-fixes,severinh/vala,playya/vala,tjol/vala-tjol,flobrosch/vala-fixes,Distrotech/vala,GNOME/vala,rvu95/vala,frida/vala,rvu95/vala,severinh/vala,Distrotech/vala,kamanashisroy/aroop